I have labs in 2 weeks after a 6 week trial of 75mg Synthroid. My last TSH was 1.70 while the T3 and T4 were in 33% of range. I would like my TSH to be as high as possible in the labs so I can ask for an increased dosage (doctor will not let me continue or increase dose if TSH is below range, which is 0.30). I will of course fast for 12 hours and take the test 24 hours after the last dose. I've heard that exercise can affect T3 but what about TSH?